Features from the website:
Double-extruded center tube provides load-bearing strength where it's needed the most
Foot piece utilizes durable rivets to secure the aluminum tubing from the inside, providing more stability than plastic connectors
Patented I-beam center post limits foot piece rotation to a 1.4 turn, always keeping the Push Button in view and facilitating easy adjustment
Long, virtually unbreakable stair deflector helps protect against the crutch slipping on stairs and helps increase stress tolerance at all angles without cracking
Non-skid rubber tips provide good traction
Built-in metal ring helps prevent excessive wear and ensures maximum durability